How can this java code display an output in BlueJ?

Question

The code below is for a graphical user interface that has a loginframe that will enable the user to input their credentials. However, when I run the code it does not show an output. Can anyone help?

        public void addComponentsToContainer() {
            container.add(userLabel);
            container.add(passwordLabel);
            container.add(userTextField);
            container.add(passwordField);
            container.add(showPassword);
            container.add(loginButton);
            container.add(resetButton);
        }
        public void addActionEvent() {
            loginButton.addActionListener(this);
            resetButton.addActionListener(this);
            showPassword.addActionListener(this);
        }
        @Override
        public void actionPerformed(ActionEvent e) {
            //Coding Part of LOGIN button
            if (e.getSource() == loginButton) {
                String userText;
                String pwdText;
                userText = userTextField.getText();
                pwdText = passwordField.getText();
                if (userText.equalsIgnoreCase("admin") && pwdText.equalsIgnoreCase("12345")) {
                    JOptionPane.showMessageDialog( null, "Login Successful" );
                    Home obj= new Home();
                    obj.setVisible(true);
                   // setVisible(false);
                } else {
                    JOptionPane.showMessageDialog ( null, "Invalid Username or Password");
                }
            }
            //Coding Part of RESET button
            if (e.getSource() == resetButton) {
                userTextField.setText("");
                passwordField.setText("");
            }
           //Coding Part of showPassword JCheckBox
            if (e.getSource() == showPassword) {
                if (showPassword.isSelected()) {
                    passwordField.setEchoChar((char) 0);
                } else {
                    passwordField.setEchoChar('*');
                }
            } 
        }
    }

DevilsHnd - 退した · Accepted Answer · 2021-12-26 10:24:03Z

You're not really showing enough information in this particular case which is why your are asked in comments to supply a Minimal Reproducible Example. Never the less, I'm going to go with the fact that you are utilizing a JPasswordField component.

To start with, for security reasons the JPasswordField#getText() method has been Deprecated as of Java 2 platform v1.2 and replaced with the JPasswordField#getPassword() method which returns a char[] Array of the password entered. Although you may still be able to compile with the getText() method for this component on the Java platform you're working with, you may be experiencing issues with it when actually running the code.

Try using the JPasswordField#getPassword() method instead and see if that makes a difference:

String userText = userTextField.getText();
String pwdText  = String.valueOf(passwordField.getPassword());
if (userText.equalsIgnoreCase("admin") && pwdText.equalsIgnoreCase("12345")) {

and it should fly...maybe...who knows without a Minimal Reproducible Example. Are you using a JPasswordField or are you using a JTextField with a DocumentFilter to mask the entered text?

Maybe your code is working and you just can't see the Message Box because you use null as the parent for the JOptionPane:

JOptionPane.showMessageDialog( null, "Login Successful" );

and the message box dialog window is sitting behind your application window. This is rather typical if the application window has the setAlwaysOnTop() property set to boolean true. This can give the impression that the application is hanging. Give the dialog a parent...perhaps try loginButton instead of null.

On a side note:

Consider hashing passwords then compare a hash with a hash. You really shouldn't hard-code or store a password as plain-text.

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